Analysis of rubbed polyimide films by polarized infrared spectroscopy : Effects of immersion in organic solvents

We applied polarized infrared (IR) spectroscopy to the analysis of rubbed polyimide (PI) films and evaluated the PI orientation induced by rubbing by measuring the dichroic difference. The IR dichroic difference and liquid crystal (LC) alignment were analyzed for rubbed PI films that were immersed i...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 35; no. 6A; pp. 3492 - 3495
Main Authors HASEGAWA, R, MORI, Y, SASAKI, H, ISHIBASHI, M
Format Journal Article
LanguageEnglish
Published Tokyo Japanese journal of applied physics 01.06.1996
Subjects
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Structure, morphology and analysis
Solvent effect
Infrared spectrometry
Polyimide
Organic solvent
Alignment
Molecular orientation
Friction
Film
Immersion
Experimental study
Liquid crystals
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Summary:We applied polarized infrared (IR) spectroscopy to the analysis of rubbed polyimide (PI) films and evaluated the PI orientation induced by rubbing by measuring the dichroic difference. The IR dichroic difference and liquid crystal (LC) alignment were analyzed for rubbed PI films that were immersed in various organic solvents. The solvents which reduced the dichroic difference and pretilt angle of LC molecules could be characterized in terms of their solubility parameters. When the dichroic difference of the PI films was greatly reduced by the immersion in the solvents, a correlation between the LC pretilt angle and the dichroic difference (i.e. the in-plane orientation of the PI molecules) was observed.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.35.3492